Stocks making the biggest moves in the premarket: GlaxoSmithKline, MicroStrategy, Shake Shack & more – CNBC

Take a look at some of the biggest movers in the premarket:
GlaxoSmithKline (GSK) The drugmaker’s stock rose 3.5% in the premarket after it detailed plans to spin out its consumer health-care busine… [+2504 chars]